I think most of us are familiar with Danny Gregory's work. I'm always amazed how he can create contour drawings and then fill in the rest of the image while creating something interesting. His skills for actually seeing what is in front of him says a lot for the practice of drawing every day. Here is a link to a beautiful video of him at work which was created by his son - http://dannygregory.wordpress.com/2011/07/25/the-art-of-breakfast/. It's a good way to start the day ;)